Fix/callback interaval balancing #135
Merged
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#133 broke random distribution of callbacks across heartbeat interval. Compared to
start_timestamp,start_timestamp_monotonicis not updated after the first call, which leads to the situation where the first call is executed with random offset, but the following ones are executed in full intervals measuring from callback's creation. Eg. 15 sec -> 60 sec -> 120 sec -> etcAnother possible fix would be to update
start_timestamp_monotonicwith first call, but that causes some data races, so I chose to use the offset in each calculation. Current expected behavior would be eg. 15 sec -> 75 sec -> 135 sec -> etc.I also added possibility to define offset for the specific callback, which is used in Dynatrace's end to end tests.